Ed Anderson wrote:

Well,
   After collecting data from several proven HALTECH F3 fuel maps and
plotting them together, the attached chart pretty clearly shows that I had
the injector timing set WAY TOO Lean after the staging point.  The Yellow
line graph (Mar17R3 Abort TO)  represents the fuel map I was using  when  I
aborted my take off after getting airborne due to the engine surging over a
2000 rpm range.

    The other colored lines represent fuel maps that have been used in 13B
powered cars flowing my approx airflow.  The pink line with no dip is a
turbo map which apparently did not use staging.   In any case, it is clear
that my selected timing after staging (the dip in timing around bar 19) was
too short in duration.  The engine ran fine immediatly after staging and
past 5300 rpm but apparently around 5500 rpm the conditions became too lean
and the surging commenced.

I have since revised my injector settings (Revised Mar23R2) to closely match
the non-turbo curve HIT02 and will try that tomorrow.

Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews NC
eanderson@carolina.rr.com

I am glad it was not too serious from a hardware point of view.
It shows however that software can also hurt you.

I could not retrieve those images Ed for some strange reason. They appear to 
be html which should display automatically but no joy.

Paul Lamar
 
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